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41 lines
1.4 KiB
JavaScript
41 lines
1.4 KiB
JavaScript
// Adapted from the documentation of https://github.com/brianc/node-postgres,
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// which is licensed under the MIT license; see file node-postgres-LICENSE.
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const pgPool = require('pg-pool');
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// create a config to configure both pooling behavior
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// and client options
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// note: all config is optional and the environment variables
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// will be read if the config is not present
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var config = {
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user: 'foo', //env var: PGUSER
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database: 'my_db', //env var: PGDATABASE
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password: 'secret', //env var: PGPASSWORD
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host: 'localhost', // Server hosting the postgres database
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port: 5432, //env var: PGPORT
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max: 10, // max number of clients in the pool
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idleTimeoutMillis: 30000, // how long a client is allowed to remain idle before being closed
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};
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//this initializes a connection pool
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//it will keep idle connections open for 30 seconds
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//and set a limit of maximum 10 idle clients
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const pool = new pgPool(config);
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pool.connect(function(err, client, done) {
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if(err) {
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return console.error('error fetching client from pool', err);
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}
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//use the client for executing the query
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client.query('SELECT $1::int AS number', ['1'], function(err, result) {
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//call `done(err)` to release the client back to the pool (or destroy it if there is an error)
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done(err);
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if(err) {
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return console.error('error running query', err);
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}
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console.log(result.rows[0].number);
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//output: 1
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});
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});
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